Fix table of content

The file is shared between internal (g3doc) and external (Bazel website). The two engines are using a different TOC syntax.

RELNOTES: None.
PiperOrigin-RevId: 234831597
diff --git a/site/docs/skylark/testing.md b/site/docs/skylark/testing.md
index 1ea1ba7..5bb5de6 100644
--- a/site/docs/skylark/testing.md
+++ b/site/docs/skylark/testing.md
@@ -11,7 +11,6 @@
 * ToC
 {:toc}
 
-
 ## For testing rules
 
 [Skylib](https://github.com/bazelbuild/bazel-skylib) has a test framework called